Using Channels #3

UsingChannels-Channel-Definition.swift

enum Theme: String {
    case light, dark
}

class UserSettings {
    
    enum Message {
        case didUpdateTheme(Theme)
    }
    
    static let shared = UserSettings()
    let channel = Channel<Message>()
    
    var theme: Theme = .light {
        didSet {
            channel.broadcast(.didUpdateTheme(theme))
        }
    }
    
    init() { }
}

UsingChannels-Channel-Usage.swift

class HomeViewController: UIViewController {
    
    let userSettings = UserSettings.shared
    
    override func viewDidLoad() {
        super.viewDidLoad()
        subscribe()
    }
    
    func subscribe() {
        userSettings.channel.subscribe(self) { (message) in
            switch message {
            case .didUpdateTheme(let theme):
                // Apply theme here.
            }
        }
    }
}

Hi! Thanks for this.
Can you show how to unsubscribe properly? And how to use the self argument passed into subscribe?